Yeast mitochondrial ATP synthase has three regulatory proteins, ATPase inhibitor, 9K protein, and 15K protein. The 9K protein binds directly to purified F1-ATPase, as does the ATPase inhibitor, but the 15K protein does not [Hashimoto, T. et al. (1987) J. Biochem. 102, 685-692]. In the present study, we found that 15K protein bound to purified F1F0-ATPase, forming an equimolar complex with the enzyme. The apparent dissociation constant was calculated to be 1.4 x 10(-5) M. The ATPase inhibitor and 9K protein also bound to F1F0-ATPase in the presence of ATP and Mg2+, and the dissociation constants of their bindings were about 3 X 10(-6) M. They bound to the enzyme competitively in the absence of 15K protein, but in its presence, they bound in equimolar amounts to the enzyme. The ATP-hydrolyzing activity of the enzyme-ligand complex was greatly influenced by the order of bindings of ATPase inhibitor and 9K protein: when the ATPase inhibitor was bound first, the activity of the enzyme was inhibited completely and was not restored by 9K protein, but when 9K protein was added first, the activity was inhibited only partially even after equimolar binding of the ATPase inhibitor to the enzyme. These observations strongly suggest that the 15K protein binds to the F0 part and functions to hold the ATPase inhibitor or 9K protein on the F1 subunit.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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